查看防火墙状态：systemctl status firewalld.service
开启防火墙：systemctl start firewalld.service
关闭防火墙：systemctl stop firewalld.service
重启防火墙：systemctl restart firewalld.service
查看已经放的端口：firewall-cmd –list-ports
开放指定端口firewall-cmd –zone=public –add-port=8083/tcp –permanent
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